US20200291850A1 - Wastegate assembly for a turbocharger - Google Patents
Wastegate assembly for a turbocharger Download PDFInfo
- Publication number
- US20200291850A1 US20200291850A1 US16/767,678 US201816767678A US2020291850A1 US 20200291850 A1 US20200291850 A1 US 20200291850A1 US 201816767678 A US201816767678 A US 201816767678A US 2020291850 A1 US2020291850 A1 US 2020291850A1
- Authority
- US
- United States
- Prior art keywords
- wastegate
- bearing bush
- sealing ring
- exhaust gas
- spindle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
- F02B37/183—Arrangements of bypass valves or actuators therefor
- F02B37/186—Arrangements of actuators or linkage for bypass valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
- F16K1/2028—Details of bearings for the axis of rotation
- F16K1/2035—Details of bearings for the axis of rotation the axis of rotation having only one bearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
- F16K1/2042—Special features or arrangements of the sealing
- F16K1/2078—Sealing means for the axis of rotation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supercharger (AREA)
Abstract
Description
- The invention relates to a wastegate assembly for an exhaust gas turbocharger.
- An exhaust gas turbocharger usually comprises a turbine housing, a compressor housing and a bearing housing arranged between the turbine housing and the compressor housing. A turbine wheel which is secured on a shaft and driven by the exhaust gas flow of an internal combustion engine is provided in the turbine housing. The rotational movement of the shaft is transferred to a compressor impeller which is similarly secured on the shaft and which is arranged in the compressor housing. The shaft is rotatably mounted in the bearing housing.
- In order to be able to rationally operate an exhaust gas turbocharger of that kind not only at high engine speeds, but also at low engine speeds it is necessary to regulate the exhaust gas mass flow flowing into the turbine housing.
- It is known to perform such a regulation of the exhaust gas mass flow flowing into the turbine housing through use of a wastegate assembly. This wastegate assembly comprises, inter alia, a wastegate flap closing a wastegate channel, a wastegate spindle and a wastegate flap lever. The wastegate flap lever is a component of a linkage system of which, in addition, a regulating rod and an actuator are part. This linkage system allows adjustment of the wastegate flap in such a way that it is closed when smaller exhaust mass flows are present and open when larger exhaust gas mass flows are present. Consequently, when smaller exhaust gas mass flows are present the entire exhaust gas mass flow is supplied to the turbine wheel and drives this. When larger exhaust gas mass flows are present a part of the exhaust gas mass flow is conducted past the turbine wheel via the wastegate channel and thus bypasses the turbine wheel.
- A regulating flap arrangement of an exhaust gas turbocharger is known from DE 10 2009 030 520 A1. This regulating flap arrangement comprises a flap plate, a flap shaft guided by means of a bush in the turbine housing and a sealing device for sealing the flap shaft at at least one sealing point. The flap shaft is connected with a regulating rod of a drive by way of an outer flap lever and with the flap plate by way of an inner flap lever. The sealing device comprises at least one resilient sealing lip which presses under bias on the sealing point.
- An actuating device for an exhaust gas flow control element of an exhaust gas turbocharger, which device can be a wastegate assembly, is known from DE 20 2011 109 832 U1. This wastegate assembly comprises a wastegate spindle which is guided in a bush and which is connected with a spindle setting element. A sheet-metal ring having resilient properties is provided as seal in the transition region between the wastegate spindle and the spindle setting shaft. This sheet-metal ring is of plate-shaped construction and has a central opening, an inner ring region and an outer ring region, the inner ring region being connected with the outer ring region by a middle ring region. The inner and outer ring regions are formed to be flat and lie in planes which are perpendicular with respect to the axis of symmetry and are offset in axial direction relative to one another, whereas the middle ring region in section along the axis extends at an inclination with respect to the two other ring regions.
- The wastegate spindle of a wastegate assembly is—as explained in the foregoing—usually mounted in a bearing bush which is pressed into the turbine housing. Since in operation of the exhaust gas turbocharger the wastegate spindle heats up more rapidly than the bearing bush it is possible for jamming of the wastegate spindle within the bearing bush to occur. In order to avoid this jamming, compensation for the thermal expansion of the wastegate spindle can be provided by way of a larger diameter of the bearing bush by comparison with the diameter of the wastegate spindle. Due to the resulting gap dimension it is possible in operation of the exhaust gas turbocharger for a part of the exhaust gas mass flow to escape in undesired manner from the turbine housing into the environment of the exhaust gas turbocharger through a leakage gap between the bearing bush and the wastegate spindle.
- A shaft sealing system for a turbocharger is known from WO 2013/0173055 A1. In this shaft sealing system use is made of a spring-mounted self-centring complementary pair of mutually opposite sealing surfaces for sealing a leakage gap between the shaft and the bearing bush. In that case, these sealing surfaces are pressed together by the force of the spring in order to achieve the desired sealing.
- A shaft device of a turbocharger is known from DE 10 2008 057 207 A1, wherein the shaft device comprises a shaft arranged in a bearing bush device and wherein the bearing bush device has at one end or both ends a receptacle for a sealing device which sealingly bears in radial direction against a respective sealing surface.
- The object of the invention consists of indicating a wastegate assembly in which this escape of part of the exhaust gas mass flow through the leakage gap between the bearing bush and the wastegate spindle into the environment is avoided.
- This object is fulfilled by a wastegate assembly with the features indicated in
claim 1. Advantageous embodiments and developments of the invention are indicated in the dependent claims. - A wastegate assembly according to the invention comprises a wastegate flap, a wastegate flap lever, a wastegate spindle and a bearing bush for the wastegate spindle. Moreover, it includes a sealing unit which is formed by a volumetric sealing ring of soft material and a plate spring in contacted with the volumetric sealing ring.
- The bearing bush preferably has a widening section into which the volumetric sealing ring is inserted.
- The volumetric sealing ring consists of soft material, preferably graphite or mica, in which one or more support layers, for example steel strips, are layered. The plate spring consists of a material with high temperature resistance, which is constructed to be resistant to, for example, temperatures above 300° C., preferably temperatures above 500° C., and preferably consists of steels with an Ni content of 6.0 to 13.0%, a Cr content of 13 to 21%, a C content below 2% and an Mn content below 2%, or is made of materials with an Ni content of above 50%, a Cr content of 17 to 22%, a Ti content of 0.5 to 2.0% and an Al content of above 0.5%. These materials are distinguished by the fact that the mechanical properties and the thermal resistance are still sufficiently retained for the spring function of the plate spring at high temperatures.
- In advantageous manner the widening section of the bearing bush is arranged in the end region, which faces the wastegate flap lever, of the bearing bush. The plate spring is positioned between the volumetric sealing ring of soft material and the wastegate flap lever. The plate spring seals between the wastegate flap lever and the volumetric sealing ring of soft material and adjusts for the wear which arises in this sealing system over the service life.
- The volumetric sealing ring of soft material is advantageously pressed into the widening section of the bearing bush so as to achieve the desired sealing action. This pressing-in of the volumetric sealing ring in the widening section takes place in axial direction, i.e. in the direction of the longitudinal axis of the wastegate spindle. A high force is exerted in radial direction on both the bearing bush and the wastegate spindle through this pressing into place in axial direction due to a high level of plastification of the material of the volumetric sealing ring. As a result, a radial bias which is maintained during operation of the exhaust gas turbocharger and amplifies the sealing effect of the volumetric sealing ring of soft material arises between the wastegate spindle and the bearing bush.
- The invention is explained in the following by way of example with reference to the figures, in which:
-
FIG. 1 shows a perspective diagram for illustration of the construction of an exhaust gas turbocharger equipped with a wastegate assembly, -
FIG. 2 shows a sectional view for illustration of a wastegate assembly, -
FIG. 3 shows a sectional view for illustration of the leakage path between the wastegate spindle and the bearing bush thereof, -
FIG. 4 shows a sectional view for illustration of a first embodiment of the invention, -
FIG. 5 shows an enlarged illustration of a sub-region of the sectional view shown inFIG. 4 and -
FIG. 6 shows a sectional view for illustration of a second embodiment of the invention. -
FIG. 1 shows a perspective sketch for illustration of the construction of an exhaust gas turbocharger equipped with a wastegate assembly. This exhaust gas turbocharger comprises aturbine housing 1, acompressor housing 2 and a bearinghousing 3 arranged between the turbine housing and the compressor housing. Theturbine housing 1 is connected with theexhaust gas manifold 1 a of an internal combustion engine, by way of which a hot exhaust gas mass flow of the internal combustion engine is fed to the turbine wheel arranged in the turbine housing. The turbine wheel is driven or set into rotation by this hot exhaust gas mass flow. As a result, the shaft (not illustrated) of the exhaust gas turbocharger, on which the turbine wheel is arranged, is also set into rotation. This rotation of the shaft of the exhaust gas turbocharger is transferred to the compressor impeller arranged in thecompressor housing 2 and similarly secured on the shaft of the exhaust gas turbocharger. Fresh air fed to the compressor is compressed through this rotation of the compressor impeller. This compressed fresh air is fed to the internal combustion engine so as to increase the power thereof. The shaft of the exhaust gas turbocharger is rotatably mounted in the bearinghousing 3. - In addition, a
wastegate assembly 5 is shown inFIG. 1 . This is arranged in theturbine housing 1 and comprises awastegate flap 5 a which is actuable by way of awastegate flap lever 5 c and awastegate spindle 5 b and which is constructed for opening and closing a wastegate channel. The actuation or control of the wastegate flap takes place with use of anactuator 6 which is connected with thewastegate flap lever 5 c by way of asetting element 6 a. - As was already mentioned above, the
wastegate spindle 5 b is mounted in the turbine housing with use of a bearing bush, wherein this bearing bush is, for example, pressed into the turbine housing. This is illustrated in the following by way ofFIG. 2 , which shows a sectional view for depiction of a wastegate assembly. The wastegate assembly illustrated inFIG. 2 comprises awastegate flap 5 a which is connected with thewastegate flap lever 5 c of alinkage system 14 by way of awastegate spindle 5 b. Moreover, a wastegate regulating rod, which is not illustrated in detail and by way of which thewastegate flap lever 5 c is connected with an actuator (similarly not illustrated in detail), is part of this linkage system. Thewastegate spindle 5 b is, inFIG. 2 , connected in its lower end region with thewastegate flap 5 a and in its upper end region with thewastegate flap lever 5 c. Thewastegate spindle 5 b is guided in thebearing bush 7, which is pressed into theturbine housing 1. - Since—as similarly already mentioned above—due to the heating up of the
wastegate spindle 5 b, which in operation of the exhaust gas turbocharger occurs more rapidly by comparison with the bearingbush 7, the diameter of the bearing bush is selected to be larger by comparison with the diameter of the wastegate spindle there is aleakage path 9 between thewastegate spindle 5 b and thebearing bush 7 in most operating states of the exhaust gas turbocharger. - This is shown in
FIG. 3 , the subject of which is a sectional view for illustration of theleakage path 9 between thewastegate spindle 5 b and thebearing bush 7. It is apparent from this sectional view this thatleakage path 9 extends over the entire length of the bearingbush 7. It is connected in its lower end region with an exhaust gas chamber arranged behind the turbine wheel in flow direction. From thisexhaust gas chamber 10 exhaust gas enters theleakage path 9, runs through this and is delivered in the upper end region of the bearingbush 7 in undesired manner to theenvironment 8 via an intermediate space between the bearingbush 7 and thewastegate flap lever 5 c. - In order to prevent this, according to the present invention use is made of a seal which is formed by a volumetric sealing ring and a plate spring contacted by the volumetric sealing ring. By volumetric sealing ring there is understood a seal for high-temperature applications, which comprises a pressed sealing ring encircling a ring axis to be closed in an encircling direction and which is constructed to be resistant to high temperatures, for example temperatures above 300° C., preferably temperatures above 500° C. This volumetric sealing ring consists of soft material, preferably of graphite or mica, in which preferably one or more thin support layers, for example fabric layers, preferably steel strips or steel foils, are layered, which when the volumetric sealing ring is inserted are pressed together with the graphite or the mica at the sealing point of the ring.
-
FIG. 4 shows a sectional view for illustration of a first embodiment of the invention. In the case of this embodiment thewastegate spindle 5 b is also guided in abearing bush 7 pressed into theturbine housing 1. This bearingbush 7 has in its upper end region inFIG. 4 a wideningsection 7 a surrounding thewastegate spindle 5 b. A volumetric sealing ring ofsoft material 11, which preferably consists of graphite or mica, in which one or more support layers, for example thin steel strips, are layered, is inserted into this wideningsection 7 a. Thisvolumetric sealing ring 11 is inserted inFIG. 4 from above in axial direction into the wideningsection 7 a of the bearingbush 7 when the wastegate assembly is assembled. Press-fitting of thevolumetric sealing ring 11 into the wideningsection 7 a of the bearingbush 7 takes place subsequently. After this press-fitting, aplate spring 17 is placed from above in axial direction on thevolumetric sealing ring 11 and is used for biasing thevolumetric sealing ring 11 in axial and radial directions. In that case, through the compacting of thevolumetric sealing ring 11 in axial direction there is exerted, due to a high degree of plastification of the material of thevolumetric sealing ring 11, a high level of force inradial direction 16 not only on thebearing bush 7, but also on thewastegate spindle 5 b. A radial biasing between the bearingbush 7 and thewastegate spindle 5 b, which is maintained over the operating service life of the wastegate assembly, thereby arises. By virtue of the press-fitting, which takes place in axial direction, of thevolumetric sealing ring 11 in the wideningregion 7 a of the bearingbush 7 and the thus-formed radial biasing between the bearingbush 7 and thewastegate spindle 5 b the sealing action of thevolumetric sealing ring 11 is increased in such a way that in operation of the exhaust gas turbocharger an undesired issue of exhaust gas, which is conducted through theleakage path 9, to the environment is effectively prevented. -
FIG. 5 shows an illustration to enlarged scale of a sub-region of the sectional view shown inFIG. 4 . Theturbine housing 1, the wideningsection 7 a of the bearingbush 7, thewastegate spindle 5 b, theplate spring 17, thevolumetric sealing ring 11 and thewastegate flap lever 5 c are illustrated in this enlarged illustration. Moreover, thepaths 12 of force and the sealing surfaces 13, which result during or through the insertion and compacting of thevolumetric sealing ring 11 into and in the wideningsection 7 a of the bearing bush, are illustrated inFIG. 5 . Moreover, it is apparent fromFIG. 5 that theturbine housing 1 has a receivingstep 1 b for reception of the wideningsection 7 a of the bearing bush. -
FIG. 6 shows a sectional view for illustration of a second embodiment of the invention. This differs from the first embodiment shown inFIG. 4 merely in that avolumetric sealing ring 11 is also provided in the lower end region of the bearingbush 7. This further volumetric sealing ring increases the security that exhaust gas cannot be delivered from theexhaust gas chamber 10 via theleakage path 9 to theenvironment 8. - 1 turbine housing
- 1 a exhaust gas manifold
- 1 b receiving step
- 2 compressor housing
- 3 bearing housing
- 4 turbocharger impeller
- 5 wastegate assembly
- 5 a wastegate flap
- 5 b wastegate spindle
- 5 c wastegate flap lever
- 6 actuator
- 6 a setting element
- 7 bearing bush
- 7 a widening section
- 8 environment
- 9 leakage path
- 10 exhaust gas chamber
- 11 volumetric sealing ring
- 12 paths of force
- 13 sealing surfaces
- 14 linkage system
- 15 axial direction
- 16 radial direction
- 17 plate spring
Claims (6)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017128830.9 | 2017-12-05 | ||
DE102017128830.9A DE102017128830A1 (en) | 2017-12-05 | 2017-12-05 | Wastegate arrangement for an exhaust gas turbocharger |
PCT/EP2018/083469 WO2019110581A1 (en) | 2017-12-05 | 2018-12-04 | Wastegate assembly for a turbocharger |
Publications (1)
Publication Number | Publication Date |
---|---|
US20200291850A1 true US20200291850A1 (en) | 2020-09-17 |
Family
ID=64664716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/767,678 Abandoned US20200291850A1 (en) | 2017-12-05 | 2018-12-04 | Wastegate assembly for a turbocharger |
Country Status (5)
Country | Link |
---|---|
US (1) | US20200291850A1 (en) |
EP (1) | EP3721066A1 (en) |
CN (1) | CN111566327A (en) |
DE (1) | DE102017128830A1 (en) |
WO (1) | WO2019110581A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005113797A (en) * | 2003-10-08 | 2005-04-28 | Aisin Seiki Co Ltd | Exhaust-gas sealing structure for turbocharger |
DE102009030520A1 (en) | 2008-07-25 | 2010-01-28 | Borgwarner Inc., Auburn Hills | Control valve arrangement for turbocharger, has sealing device for sealing flap shaft at sealing position, where sealing device comprises springy sealing lip that presses under pre-tension on sealing position |
DE102008057207A1 (en) * | 2008-11-13 | 2010-05-27 | Continental Mechanical Components Germany Gmbh | Shaft device with a sealing device |
DE202011109832U1 (en) | 2011-06-17 | 2012-04-03 | Elringklinger Ag | Actuating device for an exhaust gas flow control of an exhaust gas turbocharger |
DE202012004719U1 (en) * | 2012-05-11 | 2012-05-29 | Borgwarner Inc. | Regulating flap arrangement of an exhaust gas turbocharger |
CN104271919B (en) * | 2012-05-17 | 2018-05-01 | 博格华纳公司 | Axle sealing system for turbocharger |
GB201221116D0 (en) * | 2012-11-23 | 2013-01-09 | Aes Eng Ltd | T0 compound seal |
CN204226644U (en) * | 2014-09-04 | 2015-03-25 | 刘洪国 | Multi-teeth rollers unloader seal arrangement |
JP5907298B2 (en) * | 2015-04-16 | 2016-04-26 | 株式会社デンソー | Exhaust device for internal combustion engine |
CN105371023A (en) * | 2015-12-16 | 2016-03-02 | 湖南埃瓦新能源科技有限公司 | Dual-seal anti-disengaging type connecting device |
CN206221643U (en) * | 2016-11-24 | 2017-06-06 | 开原化工机械制造有限公司 | A kind of radial seal energized by internal pressure manhole |
-
2017
- 2017-12-05 DE DE102017128830.9A patent/DE102017128830A1/en active Pending
-
2018
- 2018-12-04 US US16/767,678 patent/US20200291850A1/en not_active Abandoned
- 2018-12-04 WO PCT/EP2018/083469 patent/WO2019110581A1/en unknown
- 2018-12-04 EP EP18819016.9A patent/EP3721066A1/en active Pending
- 2018-12-04 CN CN201880078724.4A patent/CN111566327A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2019110581A1 (en) | 2019-06-13 |
DE102017128830A1 (en) | 2019-06-06 |
EP3721066A1 (en) | 2020-10-14 |
CN111566327A (en) | 2020-08-21 |
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